Journal ArticleDOI
Band gap fluorescence from individual single-walled carbon nanotubes.
Michael J. O'Connell,Sergei M. Bachilo,Chad B. Huffman,Valerie C. Moore,Michael S. Strano,Erik H. Haroz,Kristy L. Rialon,Peter J. Boul,William H. Noon,Carter Kittrell,Jianpeng Ma,Jianpeng Ma,Robert H. Hauge,R. Bruce Weisman,Richard E. Smalley +14 more
TLDR
At pH less than 5, the absorption and emission spectra of individual nanotubes show evidence of band gap–selective protonation of the side walls of the tube, which is readily reversed by treatment with base or ultraviolet light.Abstract:
Fluorescence has been observed directly across the band gap of semiconducting carbon nanotubes. We obtained individual nanotubes, each encased in a cylindrical micelle, by ultrasonically agitating an aqueous dispersion of raw single-walled carbon nanotubes in sodium dodecyl sulfate and then centrifuging to remove tube bundles, ropes, and residual catalyst. Aggregation of nanotubes into bundles otherwise quenches the fluorescence through interactions with metallic tubes and substantially broadens the absorption spectra. At pH less than 5, the absorption and emission spectra of individual nanotubes show evidence of band gap-selective protonation of the side walls of the tube. This protonation is readily reversed by treatment with base or ultraviolet light.read more
Citations
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HIV Detection via a Carbon Nanotube RNA Sensor
Jackson D. Harvey,Jackson D. Harvey,Hanan A. Baker,Hanan A. Baker,Michael V. Ortiz,Alex Kentsis,Alex Kentsis,Daniel A. Heller,Daniel A. Heller +8 more
TL;DR: An unexpected phenomenon wherein the carbon nanotube optical response to nucleic acids can be enhanced by denatured proteins is discovered, portending a route toward point-of-care optical detection of viruses or other nucleic acid-based analytes.
Journal ArticleDOI
Mapping charge transport by electroluminescence in chirality-selected carbon nanotube networks.
Florian Jakubka,Claudia Backes,Claudia Backes,Florentina Gannott,Udo Mundloch,Frank Hauke,Andreas Hirsch,Jana Zaumseil +7 more
TL;DR: In this paper, random network single-walled carbon nanotube (SWNT) field effect transistors (FETs) in bottom contact/top gate geometry with only five different semiconducting nanotubes species were selected by dispersion with poly(9,9-dioctylfluorene) in toluene.
Journal ArticleDOI
Chirality-Dependent Combustion of Single-Walled Carbon Nanotubes
Yasumitsu Miyata,Takazumi Kawai,Yoshiyuki Miyamoto,Kazuhiro Yanagi,Yutaka Maniwa,Hiromichi Kataura +5 more
TL;DR: In this article, the chirality-dependent combustion of single-walled carbon nanotubes (SWCNTs) during oxidation in both air and hydrogen peroxide was investigated using photoluminescence and Raman spectroscopy.
Journal ArticleDOI
Hyperthermia approaches for enhanced delivery of nanomedicines to solid tumors
TL;DR: This review covers the use of nanoparticles in drug delivery, the different methods for inducing localized hyperthermia, combination effects of hyperThermia, and successful strategies for improving the delivery of nanomedicines usinghyperthermia.
Journal ArticleDOI
Color-tunable photoluminescent fullerene nanoparticles.
Jinyoung Jeong,Juyeon Jung,Mi Jin Choi,Ju Whan Kim,Sang J. Chung,Su-Jin Lim,Han Lee,Bong Hyun Chung +7 more
TL;DR: Highly water-soluble and color-tunable photoluminescent fullerene nanoparticles are synthesized by using tetraethylene glycol and lithium hydroxide as a catalyst and the PL behavior is attributed to an electronic transition change due to the distortion of symmetrical C(60).
References
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Journal ArticleDOI
CHARMM: A program for macromolecular energy, minimization, and dynamics calculations
Bernard R. Brooks,Robert E. Bruccoleri,Barry D. Olafson,David J. States,S. Swaminathan,Martin Karplus +5 more
TL;DR: The CHARMM (Chemistry at Harvard Macromolecular Mechanics) as discussed by the authors is a computer program that uses empirical energy functions to model macromolescular systems, and it can read or model build structures, energy minimize them by first- or second-derivative techniques, perform a normal mode or molecular dynamics simulation, and analyze the structural, equilibrium, and dynamic properties determined in these calculations.
Journal ArticleDOI
MOLSCRIPT: a program to produce both detailed and schematic plots of protein structures
TL;DR: The MOLSCRIPT program as discussed by the authors produces plots of protein structures using several different kinds of representations, including simple wire models, ball-and-stick models, CPK models and text labels.
Journal ArticleDOI
Crystalline Ropes of Metallic Carbon Nanotubes
Andreas Thess,R. S. Lee,Pavel Nikolaev,Hongjie Dai,Pierre Petit,J. Robert,Chunhui Xu,Young Hee Lee,Seong-Gon Kim,Andrew G. Rinzler,Daniel T. Colbert,Gustavo E. Scuseria,David Tománek,John E. Fischer,Richard E. Smalley +14 more
TL;DR: X-ray diffraction and electron microscopy showed that fullerene single-wall nanotubes (SWNTs) are nearly uniform in diameter and that they self-organize into “ropes,” which consist of 100 to 500 SWNTs in a two-dimensional triangular lattice with a lattice constant of 17 angstroms.
Book
Science of fullerenes and carbon nanotubes
TL;DR: In this paper, the authors present a detailed overview of the properties of Fullerenes and their properties in surface science applications, such as scanning tunnel microscopy, growth and fragmentation studies, and chemical synthesis.
Journal ArticleDOI
Constant pressure molecular dynamics simulation: The Langevin piston method
TL;DR: In this paper, a new method for performing molecular dynamics simulations under constant pressure is presented, which is based on the extended system formalism introduced by Andersen, the deterministic equations of motion for the piston degree of freedom are replaced by a Langevin equation; a suitable choice of collision frequency then eliminates the unphysical "ringing" of the volume associated with the piston mass.